What to do when Rebel T3i is unresponsive?

[tmcdanel]

The red battery light flashes when insert it, and the battery works my other camera, a T5I. But even with a good battery, the T3i remains unresponsive, dead, no menu, no auto-focus... as if it has no battery. The battery case terminals appear good, and look clean.

I am hoping there is some kind of software reset, or some simple fix i am missing? 

[ebiggs1]

I would try a new battery and SD card but it sounds like,

time for Canon Service.

[tmcdanel]

Thank you for the reply ebbigs1.

The problem appears to be the SD door microswitch. It is difficult to see. I hope it simply has a grain of dirt or something in it. Will try air.

For those finding this in the future, a more detailed, and thorough thread is here:

photography-on-the.net/forum